Fagoting stitching machine



April 12, 1938. EL MA 2,114,075

FAGOTING STITCHING MACHINE Filed Feb. 27, 1937 2 Sheets-Sheet 1 PEG. 1.

INVENTOR.

Ahrham [bellman BY I ATTORN EY.

April 12, was. A, GELLMAN 2,114,075

FAGOTING STITCHING MACHINE Filed Feb. 27, 1957 2 Sheets-Sheet 2 FIG 3@Abraham Bellman ATTO R N EYv INVENTOR.

Patented Apr. 12, i9

STA'FEQ PATENT GFFICE This invention relates to improvements inornamental stitch sewing machines, and more particularly to a mechanismfor actuating the stitch forming means of such machines.

At the present time, machines provided forv sewing ornamental stitching,such as fagoting, are capable of producing such stitching onlyrelatively slowly. In addition to this limitation in speed, emstingmachines are capable of producw ing ornamental stitching of only a verylimited Width.

An object of this invention is, therefore, to provide a mechanism whichwill greatly increase the speed with which such stitching may beproduced. Another object is an ornamental stitch sewing machine whichmakes possible the production of stitching of much greater width thanhas been possible with the machines heretofore used. Another object isto provide a compact assembly of parts of a mechanism for actuating thestitch forming means, whereby the cams and associated portions of theneedle shifting mechanism and of the actuating mechanism for the feedadvance are disposed in juxtaposition and readily accessibie foradjustments, repairs, and the like. Other objects and advantages of theinvention will be apparent during the course of the following detaileddescription thereof, taken in connection with the accompanying drawings,

I forming a portion of this specification, and in which drawings:

Fig. l is a side elevation of a conventional zig-zag sewing machinehaving associated therewith my improved mechanism which actuates thestitch forming means, and which converts the machine into one capable ofproducing fagoting stitching of large width at high speed;

Fig. 2 is a side elevation, opposite that shown in Fig. l. of themachine and novel mechanism;

Fig. 3 is a top plan view of the structure shown in Figs. 1 and 2;

Fig. 4 is a side elevation of the novel mechanism, detached from thesewing machine;

Figs. 5 and 6 are sections, taken upon sub- 5 stantially the lines 5-5and 6-8 of Fig. 4; and

Fig. '7 is a plan view in fuli size of the orna mental stitching made bymy improved machine.

In carrying out my invention I have associated in a novel manner withthe zig-zag type of 6b sewing machine which is constructed for highspeed operation, a combination of mechanical parts which make possiblethe successful actuation of the needle and feed advance mechanism forthe manufacture at high speed of fagoting stitching of widthconsiderably wider than hitherto possible. By the mechanism describedherein the tapes or strip materials joined by the stitching may easilybe spaced one-half inch or more.

The ornamental stitch sewing machine, shown by Way of example in thedrawings, includes the usual high speed zig-zag machine having astandard i, from which projects a bracket arm 2, terminating in a head3. The bracket arm 2' and head 3 are disposed above a bed plate 6.Extending longitudinally through the bracket arm 2 is a main drive shaft5 carrying a worm gear 6 intermediate its ends and housed within thebracket arm 2. This main shaft 5 is omratively connected, as is wellknownin the art, with the stitch forming means which ordinarily includesa. vibrating needle bar frame i, carrying needle 8, so as to provide fora reciprocation of the needle, through a suitable opening in the needleplate it carried by the bed plate 4, in order that the thread or othermaterial upon the needle 8 will lock with the thread or other materialcar- .ried by a bobbin ill disposed-.below the needle plate 9.

Beneath the bed plate t is a feed advance rocker shaft ll operativelyconnected, as is well known in the art, with the feed advance means,including a pair of feed dogs it, having a roughened file-like surfaceproviding work-engaging teeth which project upwardly through openings inthe needle plate 9. The feed dogs are longer, wider and are spacedfurther apart than the similar parts in the known type of fagotingstitching machine.

Meshing with the worm gear ii is. a suitable gear i3 carried by thedriven shaft M which extends transversely of the bracket arm 2 and belowthe main shaft 5, being journaled in suitable bearings in the bracketarm 2 and projecting outwardly therefrom at one side of the latter, asshown in Fig. 3.

The novel mechanism for actuating the stitch forming means, includes asuitable support which may be a plate i5. having a pair of oppo sitefaces, one of which may be designated as the outer face It and theother, the inner face IT. From the inner face ll may project one ormore.lugs It provided with bores It, so that suitable means may beprovided for attaching the plate is to the bracket arm 2. In the exampleshown, the shanks of screws 28 extend through the bores i9 and intosuitable screwthreaded sockets in the wall of the bracket arm 2 so thatthe plate i5 may be detachably secured to the bracket arm,.but spacedtherefrom, substantially as shown in Figs. 1 to 3.

A bore 2|, extending through the plate l5, accommodates the protrudingend of the shaft 14 so that a suitable driving gear 22, designated asthe main driving gear, may be rotatably carried thereby and extend fromthe outer face' I6.

Meshing with the gear 22 is a needle vibrating cam gear 23, rotatablycarried by the plate l5 and mounted to rotate upon a suitable pivot,such as the smooth portion of the shank of a suitable screw 24, which isdetachably secured to the plate l5. This gear 23 is provided in one ofits faces, preferably the outer face, with a cam groove 25 of suitableconfiguration.

Extending into this cam groove 25 is -a roller 26, rotatably carried bya rocker arm 21, as at one end thereof and with the other end of the armadjustably secured, as by a set screw 28, to a shaft 29 extendingthrough a suitable perforation 30 in the plate l5 and terminating in anadjusting segment lever 3| having a slot 32 ac cornmodating the shank ofa suitable adjusting and securing member, such as a wing nut 33, forconnecting thereto a shifting bar 34, which is detachably connected tothe swinging frame I as by a stud 35 the shank of which passes through aperforation ordinarily found in swinging frames. It will be noted inFigs. 1 and 2 that the operative connection of the actuating mechanismfor this portion of the stitch forming means is quite direct and short.The adjustment provided by the slot 32 increases or decreases the widthof the stitch by varying the amplitude of motion of the needle as willbe readily apparent.

A second gear meshes with the gear 22, this being a feed cam gear 36rotatably carried by the plate I5 and mounted to rotate upon a suitablepivot, such as the smooth portion of the shank of a suitable screw 31,which is detachably secured to the plate 15. Preferably, the feed camgear 36 is provided in its outer face with a cam groove 38 of suitableconfiguration.

Projecting into the cam groove 38 is a roller 39 rotatably carried bythe feed rocker arm 40, as by a suitable pivot pin 4|. This arm 40 issuitably pivoted to the plate l5 and may extend over a portion of theouter face I 6 substantially as shown in Fig. 1.

The feed rocker arm 40 may be provided with an arcuate slot 42 throughwhich extends a screw threaded shank 43 having, for example, a wing nut44 upon one protruding end and coupling a feed connection rod or member45 to the arm 40 at its other end. Slot 42 is to decrease or increasethe length of the stitch by varying the motion of the feed dogs.

This rod 45 extends downwardly through a suitable opening 46 in the bedplate 4. At its lower end, the rod 45 is detachably secured, as by acrank arm 41, to the rock shaft H.

The needle vibrating cam is larger than the feed cam and its gear isprovided with teeth in such excess of that of the feed cam as will causethe less'rapidly rotating needle vibrating cam to vibrate the needle barframe in the required relation to the feed actuated by the feed cam.

The numeral ll indicates the shaft, driven by belt 5', for revolving thehook (not shown) which is conventional on zig-zag machines.

I have found after experimenting with various mechanisms for producingimproved fagoting machines that the arrangement of parts above describedembodies a highly practical, if not the only practicable, mechanism forproducing at high speed large stitching of the fagoting type.

As many apparently widely diiferent embodiments of this invention may bemade without departing from the spirit and scope thereof, it is to beunderstood that I do not limit myself to the specific embodimentsthereof except as defined in the appended claims.

I claim:

1. A fagoting stitching machine comprising in combination with a zig-zagsewing machine provided with a vibrating needle bar frame, a main driveshaft, a driven shaft, and a feed advance rock shaft, of a supportmounted on said machine, said driven shaft extending through saidsupport and having a driving gear thereon exteriorly of said support, aneedle vibrating cam rotatably carried by said support and driven bysaid driving gear, a rocker arm pivotally carried by said support andactuated by said cam, a segment lever rocked by said rocker arm, ashifting bar pivoted to and adjustable longitudinally on said segmentlever and pivoted at its other end to said vibrating needle bar frame, afeed cam rotatably carried by said support and driven by said drivinggear, a feed rocker arm pivotally carried by said support and rocked bysaid feed cam, and a feed connection rod pivotally engaging said feedrocker arm and longitudinally adjustable thereof, said feed connectionrod actuating said feed advance rock shaft.

2. A fagoting stitching machine comprising in combination a vibratingneedle bar frame, a feed advance rock shaft, a rotatable needlevibrating cam consisting of a gear provided with a cam groove in itsface, a feed cam mounted to rotate on a separate parallel axis andconsisting of a gear provided with a cam groove in its face, a

driven gear having its teeth meshing with the teeth on both of saidcams, a pivoted needle vibrating rocker arm one arm of which engages thegroove in said needle vibrating cam, a shifting bar actuated by theother arm of said needle vibrating rocker arm and attached to saidneedle bar frame, adjusting means positioned between said needlevibrating cam and needle bar frame to vary the width of the stitchingmade by the needle, a feed rocker arm engaging the groove in said feedcam, a feed connection rod connecting said feed rocker arm and said feedrock shaft to rock the latter, and adjusting means positioned betweensaid feed cam and said feed advance rock shaft for varying the length ofthe stitch. ABRAHAM GELLMAN.

